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Results from Suction Controlled Laboratory Tests on Unsaturated Bentonite – Verification of a Model
Summary Highly compacted bentonite has been proposed as buffer material in the Swedish concept for the disposal of nuclear waste. A laboratory program with focus on hydro-mechanical properties of unsaturated highly compacted bentonite has been running and one part included changes in volume. The results could be used to determine different moduli but are presented here as a verification of a model covering the impact of confinement on the retention properties. The tests were performed with suction control, which was achieved by the vapour equilibrium technique. The applied relative humidity was approximately 85% in the tests presented in this paper. The tests were done both as constant load tests with a change in relative humidity and as tests with constant relative humidity and a change in the applied load. The load was applied axially and the maximum constant load corresponded to an axial stress of 20 MPa. Also the radial stress was measured. All tests started from a compacted condition with a water content of 10% and a void ratio of approximately 0.6. The investigation showed that the model, which was mainly based on constant volume tests, also seems to be valid after volume change since good agreement was achieved between measured and calculated results in the presented examples.
Results from Suction Controlled Laboratory Tests on Unsaturated Bentonite – Verification of a Model
Summary Highly compacted bentonite has been proposed as buffer material in the Swedish concept for the disposal of nuclear waste. A laboratory program with focus on hydro-mechanical properties of unsaturated highly compacted bentonite has been running and one part included changes in volume. The results could be used to determine different moduli but are presented here as a verification of a model covering the impact of confinement on the retention properties. The tests were performed with suction control, which was achieved by the vapour equilibrium technique. The applied relative humidity was approximately 85% in the tests presented in this paper. The tests were done both as constant load tests with a change in relative humidity and as tests with constant relative humidity and a change in the applied load. The load was applied axially and the maximum constant load corresponded to an axial stress of 20 MPa. Also the radial stress was measured. All tests started from a compacted condition with a water content of 10% and a void ratio of approximately 0.6. The investigation showed that the model, which was mainly based on constant volume tests, also seems to be valid after volume change since good agreement was achieved between measured and calculated results in the presented examples.
Results from Suction Controlled Laboratory Tests on Unsaturated Bentonite – Verification of a Model
Dueck, Ann (Autor:in)
01.01.2007
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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